docs: def part_of_speech(phrase, format='json'):
          """
          querrying Wordnik's API for knowing whether the word is a noun, adjective and the like
  
          :params phrase: word for which part_of_speech is to be found
          :param format: response structure type. Defaults to: "json"
          :returns: returns a json object as str, False if invalid phrase
          """
          # We get a list object as a return value from the Wordnik API
          base_url = Vocabulary.__get_api_link("wordnik")
          url = base_url.format(word=phrase.lower(), action="definitions")
          json_obj = Vocabulary.__return_json(url)
  
          if not json_obj:
              return False
  
          result = []
          for idx, obj in enumerate(json_obj):
              text = obj.get('partOfSpeech', None)
              example = obj.get('text', None)
              result.append({"seq": idx, "text": text, "example": example})
  
          return Response().respond(result, format)